Computer Science – Sound
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt.........4r&link_type=abstract
PhD Thesis,. Proquest Dissertations And Theses 2006. Section 0036, Part 0606 128 pages; [Ph.D. dissertation].United States --
Computer Science
Sound
1
Convection, Overshoot, Gravity Waves, Sun
Scientific paper
The research presented here can broadly be described as investigating hydrodynamic processes in the solar interior. These processes are broken into two main categories for clarity: (1) penetrative convection and mixing and (2) gravity wave dynamics, which includes generation, dissipation and angular momentum transport. With regard to penetrative convection, we find that overshooting convective motions enforce a slightly extended mildly subadiabatic region just below the convective-radiative interface (at 0.718 [Special characters omitted.] ) to (very) approximately 0.714 [Special characters omitted.] , which represents 0.05H p . Subadiabatic overshoot and mixing of tracer particles extends to 0.687 [Special characters omitted.] . Heating of the overshoot region by plumes produces a slightly larger temperature than that given by the standard solar model. This discrepancy is in the same sense and has the same amplitude as the standard solar model-helioseismology sound speed discrepancy and may provide an alternate or additional explanation for that difference.
The inclusion of both convective and radiative regions leads naturally to the self-consistent generation of internal gravity waves. The constant, out-of- phase, bombardment generates a broad spectrum of waves ranging in frequency from 1-300mHz. The wave energy flux generated at the base of the convection zone in the m=1 wavemode is two orders of magnitude lower than previous analytic estimates. However, our simulations show energy which is rather uniformly distributed in frequency, yielding an integrated kinetic energy flux below the convection zone similar to previous estimates (namely F waves F T M). Our simulations indicate that linear wave theory is only valid deep below the convectioe-radiative interface, breaking down both just beneath the convection zone and in the solar core. Investigation of the angular momentum transport by overshooting plumes dictates the behavior of the tachocline. However, internal gravity waves (IGW) do couple angular velocity variations in the tachocline with those in the deep radiative interior.
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